
<template>
  <scroll id="tab-menu">
    <div
      class="menu-list-item"
      :class="{ active: index === currentIndex }"
      v-for="(item, index) in categories"
      :key="index"
      @click="itemClick(index)"
    >
      {{ item.title }}
    </div>
  </scroll>
</template>

<script>
import Scroll from 'components/common/scroll/Scroll'
export default {
  name: "TabMenu",
  components: { 
      Scroll 
    },
    props:{
        categories:{
            type:Array,
            default(){
                return []
            }
        }
    },
    data() {
        return {
            currentIndex:0
        }
    },
    methods: {
        itemClick(index){
            this.currentIndex=index;
            this.$emit('selectItem',index) //告诉父组件所选择的菜单item的下标
        }
    },
};
</script>

<style scoped>
#tab-menu {
    background-color: #f6f6f6;
    height: 100%;
    width: 100px;
    box-sizing: border-box;
}
.menu-list-item {
    height: 45px;
    line-height: 45px;
    text-align: center;
    font-size: 14px;
}
  .menu-list-item.active {
    font-weight: 700;
    color: var(--color-high-text);
    background-color: #fff;
    border-left: 3px solid var(--color-high-text);
  }
</style>